Refuse-derived fuel and integrated calcium hydroxide sorbent for coal combustion desulfurization

Sheng Chu, Cheng Zhu, Geoffrey A. Tompsett, T. J. Mountziaris, Paul J Dauenhauer

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Pelletized refuse-derived fuel (RDF; 65 wt % nonrecyclable fibers/plastics) and integrated calcium hydroxide sorbent (35 wt %), referred to as a ReEngineered Feedstock (ReEF), were evaluated as a renewable fuel and an in situ sulfur sorbent within pulverized coal combustion. Characterization of ReEF with scanning electron microscopy-energy-dispersive X-ray spectroscopy indicated random distribution of calcium hydroxide sorbents on fiber/plastic particles. The sulfation kinetics of ReEF combustion were evaluated in a drop-tube reactor at variable conditions (800-1000 °C, 1400 ppm of SO2, and 5-30% O2 in N2) with continuous effluent characterization via online IR spectroscopy. Sulfation of calcium hydroxide in ReEF was delayed because of RDF combustion when compared with pure calcium hydroxide sorbent. A low-O2 condition was shown to produce high conversion of calcium hydroxide to calcium sulfate X(Ca(OH)2) > 0.4), while calcination and combustion of ReEF in a high-O2 environment (O2 > 20%) resulted in increased sorbent sintering and reduced total sulfur uptake.

Original languageEnglish (US)
Pages (from-to)3136-3144
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume54
Issue number12
DOIs
StatePublished - Apr 1 2015

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